成果報告書詳細
管理番号20130000000964
タイトル*平成24年度中間年報 低炭素社会を実現する革新的カーボンナノチューブ複合材料開発プロジェクト グラフェン基盤研究開発 高性能フレキシブルグラフェン部材研究開発:グラフェン透明導電フィルムと高熱伝導性多層グラフェン放熱材の研究開発
公開日2013/10/18
報告書年度2012 - 2012
委託先名技術研究組合単層CNT融合新材料研究開発機構
プロジェクト番号P10024
部署名電子・材料・ナノテクノロジー部
和文要約
英文要約Title: Research and Development of High-Quality Flexible Graphene Members: Graphene Transparent Conductive Films and Highly-Thermal Conductive Multilayer Graphene for Heat Dissipation / Basic Research and Development of High-Quality Graphene / Innovative Carbon Nanotubes and Their Application Project (FY2012-FY2014)FY2012 Annual Report
1. Development of flexible graphene transparent conductive film
It was attempted to quality improvement by determining the gas ratio and gas species. We tried to develop the precise control method of the layer numbers and to enhance the film quality of graphene. Removal technique of the copper oxide and the defects on the substrate surface was developed as well as the forming technique of active layer of graphene synthesis. For the purpose of lowering the resistance of the graphene flakes, we explored the effective dopant for further reduction of the resistance. In connection with the development of the transfer technique of graphene, it was attempted to optimize the coating and bonding method by selecting the adhesives. The target of this fiscal year of the controllability of the layer numbers, transmittance of 93% for graphene itself and the sheet resistance of 500ohm were successfully achieved by the activities mentioned above.
2. Development of highly thermal conductive multilayer graphene as heat dissipation materials
We have established a film production technology of the PI thin films in the range of 2-7.5μm to thin film fabrication techniques. Carbonization and graphitization of thin PI film were examined, in which we focused attention on sort of PI, film thickness, carbonization and graphitization processes, fillers, and anti-wrinkle. As a result we succeeded in preparation of sample with conductivity of 25,000S/cm with a thickness of 2μm, which was the target of this fiscal year. We have also been developing the methods to prepare a graphite film by heat treatment of BBL polymer to control the orientation. We have confirmed the synthesis of the graphite film with 25,000S/cm with 50nm thickness by 3000 ℃ process.
3. Development of evaluation technology for graphene to improve its quality
We have performed the evaluation such as optical constants of graphene. The optical constants of refractive index and extinction coefficient of graphene are the same level as those of highly oriented pyrolytic graphite(HOPG), which we have met the target of this fiscal year. We have established the method to create the sample for Hall effect measurement in very small region. The analysis of the fine structure was performed to complete the observation of the surface morphology of the graphene by probe microscope. The thermal diffusivity measurement in the in-plane direction of the free-standing multilayer graphene was subjected by the temperature measuring method with periodical heating. We have developed a thermal diffusivity measurement method using pulsed light heating method.
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